To have the best message receive experience on Huawei Phones, please do the following.
Step 1: Open 'Settings'
Step 2: Under 'APPS' open 'Manage apps'
Step 3: Scroll down to find 'Skooly'
Step 4: Select the button next to 'Show notifications' to enable notification for Skooly.
Step 5: Press Back to save your settings
Step 6: Open 'Settings'
Step 7: Select 'Protected apps' under 'Privacy & Security'
Step 8: Swipe right to enable Skooly
Step 9: And you are done, notifications should work just fine for Skooly app.